Post-type arc-lamp



C. AALBORG.

POST TYPE ARC LAMP.

APPLICATION FILED MAY 4, 1915.

1 ,309,7 1 1 Patented July 15, 1919.'

INVENTOR ATTORNEY UNITED STATES PATENT OFFICE.

CHRISTIAN AALBORG, OF WILKINSBURG, PENNSYLVANIA, ASSIGNOR TO WEST-INGHOUSE ELECTRIC AND MANUFACTURING COMPANY, A CORPORATION OFPENNSYLVANIA.

POST-TYPE ARC-LAMP.

Specification of Letters Patent.

Patented July 15, 1919.

To all whom it may concern:

Be it known that I, CHRISTIAN AALBORG, a citizen of the United States,and a resident of Wilkinsburg, in the county of Allegheny and State ofPennsylvania, have invented a new and useful Improvement in Post-TypeArc-Lamps, of which the following is a specification.

My invention relates to electric lighting, and it has special referenceto electric arc lamps of the inclosed flaming or luminous type.

More particularly, my invention refers to are lamps of theabove-mentioned character which are adapted for post-mounting.

For decorative street lighting, post-type are lamps have come intocommon use. However, inclosed flaming-arc lamps which comprise doubleglobes, do not readily lend themselves for post-mounting because of thedifficulty in performing the trimming operations thereupon. Ordinarily,it is necessary to remove both the inner and outer globes of such lampsin ordeiwto have access to the electrodes for replacing them when theyare substantially consumed in the are. As a result, a complicated lampstructure has heretofore been embodied in inclosed are lamps adapted forpost-mounting.

One object of my invention is to provide an arc lamp of the characterindicated which will be simple in construction and operation, and whichwill readily lend itself to periodical inspection. Moreover, thetrimming operation may be expeditiously effected because of the easyaccessibility of the electrodes. Other features of novelty embodied inmy invention will be described in the following specification, and willbe pointed out with particularity in the appended claims.

To more fully understand the characteristic features of my invention,reference may be had to the following description and the accompanyingdrawing in which Figure 1 is a view, partially in elevation andpartially in section, of an arc lamp embodying a form of my invention,Fig. 2 is an enlarged plan view taken on the line IIII of Fig. 1 andwith the outer globe removed, showing aportion of my lamp structure andFig. 3 is an enlarged detail view, partially in section, of a portion ofthe device as shown in Fig. 1.

In general, my are lamp is disposed upon a pedestal or main support 1having a chamber 2 in the upper end thereof. An insulator 3, which mayconform to the design of the pedestal 1, insulates the superstructurefrom the portion of the pedestal below the chamber 2. The top surface ofthe pedestal 1 provides a seat for an annular member 5 having a centralopening 44: therethrough and which is pivotally connected to thepedestal at 5 in such manner as will permit the former to be rotativelymoved in a horizontal plane to a posit-ion indicated by dotted lines.The main portion of the arc lamp is supported upon the annular member 5and comprises cooperating electrodes (3 and 7, an inner globe 8, whichprovides an arc chamber for the are extending between the adjacent endsof said electrodes, and an outer globe 9, which substantially inclosesthe inner globe 8 and provides a dead air space 10. As is well known inthe art, the dead air space 10 precludes the condensation of fumes andvapors upon the inner surface of the globe 8.

Spaced members or rods 11, which are screwed, at their lower ends, intothe annular member 5, support, at their upper ends, a main platform 12and an annular member 13, the latter comprising an imperforate ringbetween the chamber provided by the globe 9 and a condensing chamber 14disposed thereabove.

The arc-inclosing chamber 8 communicates with the condensing chamber1-1: through an annular passageway 15, both of said chambers beingclosed against the outer air. The lower edge of the outer globe 9engages an upwardly-extending flange 16 formed on the upper face of theannular member 5, and its upper edge engages an annular flange 17 formedon the lower por tion of a shell member 18. In this manner, the dead airspace 10 is closed against the circulation of air currents, therebyimproving the heat insulation accorded the inner globe 8. The condensinghamber 1 1 is inclosed by the lenticularly-shaped portions 19, providedat the lower portion of the shell 18, and by a tubular shell member 20which is attached, in any suitable manner, to the upper surface of theplatform 12.

The upper electrode 6 projects through an opening 21 in the platform 12and an economizer 22. A ring-type clutch 23, of any suitable form, isadapted to engage the electrode 6 during the operation of the lamp. En-

gagement between the clutch ring 23 and the electrode 6 is effected bythe movement of a rocker arm 24 that is pivoted at 25 to a support 26which, in turn, is attached to the under side of an upper platform 27.Movement of the rocker arm 24 is imparted to the clutch ring 23 by meansof a link 28 which is pivotally connected, at its lower end, to theclutch ring and, at its upper end, to one end of said rocker-arm.

The lower electrode 7 is supported in a holder 29 that slidingly engagesa sleeve 30, the holder 29 being connected, by means of a flexibleconnection 31, to a pulley 32. The upper electrode 6 is connected, bymeans of a flexible connection 33, to a pulley 34.

The pulleys 32 and 34 are rigidly connected together and rotate about acommon center 35 on the rocker arm 24. Assuming that the rate ofconsumption of the upper electrode 6 is double that of the lowerelectrode 7, it is apparent that the electrodes should be fed into thearc in proportion to their respective rates of consumption so that thearc may be focused or kept in a constant position. By making thediameter of the pulley 34, from which the upper electrode is fed, equalto twice the diameter of the pulley 32, from which the lower elec trodeis fed, means is provided for focusing the arc.

Regulating coils 36 and 36 of my arc lamp are disposed in the chamber 2of the pedestal 1, and comprise plungers 37 and 37, respectively, whichare pivotally connected to a rocker arm 38 that is fulcrumed at 39. Themovement imparted by the regulating coils 36 and 36 to the rocker arm 38is transmitted to the aforementioned rocker arm 24'through a member 40that extends from the chamber 2 through the dead air space 10 and thecondensing chamber 14 into the upper portion of the shell 18. Of course,it will be understood that the member 40 slides easily through thoseopenings through which it projects in order to minimize the frictionalresistance to be overcome by the regulating coils 36.

l/Vhen the annular member 5 and the lamp structure are moved to theposition shown by the dotted lines of Fig. 1, the member 40 is retainedin its normal position by reason of a swivel joint 41 embodied in itslower portion. The joint 41 as best shown in Fig. 3, is so constructedthat it permits the upper portion of the member 40 to be turned about avertical axis but it precludes any rela tive vertical movement betweenits upper and lower portions, and consists of a socket member 45 adaptedto receive the lower end of the member 40, which is annularly grooved at46 to engage the inner end of a set screw 47. 'A tubular member 42,which corresponds to the supporting member 11, permits leads 43 toextend therethrough and into the chamber provided by the shell 18 inorder to provide means for making electrical connections to theelectrodes 6 and 7. Assuming that the plunger 37 is moved downwardly byits operating magnet coil 36, the rocker arm 38 is tilted in such amanner as to cause a downward movement of the member 40 which, in turn,imparts a corresponding movement to the rocker arm 24. As the rocker arm24 moves upon its pivot 35, the upper electrode 6 is moved upwardly, andthe lower electrode 7 is moved downwardly. Regulation of the arc is thusaccomplished by the rocking of the lever 38 which movement, in turn, istransmitted by the member 40 to the regulating mechanism disposed in thechamber provided by the shell 18. A similar sequence of operations iseffected when the plunger 37 is drawn. downwardly into its operatingcoil 36 In this instance, however, the length of the are between theelectrodes 6 and 7 is decreased.

The lamp shown is of the intermittentfeed type, and the feedingoperation is effected when the clutch ring 23 engages the upper surfaceof the platform 12, thereby releasing the upper electrode 6. lVhen theupper electrode 6 is released, it will move downwardly, and the rotativemovement thus imparted to the pulleys 32 and 34 will move the lowerelectrode 7 upwardly.

Vhen the trimming operation is to be performed, it is necessary toremove the inner globe 8 is order to have access to the electrodes 6 and7. Consequently, the annular member 5 and the lamp structure supportedthereby, are turned, in a horizontal plane, about the pivot 5 to theirdotted-line positions. The operator may then disengage the inner globe 8from its bail support 48, inasmuch as he has access thereto through theopening 44 provided by the annular member 5. The inner globe 8 may beremoved through the opening 44, as shown by the dotted lines. It will benoted, furthermore, that the regulating mechanism of the lamp is notaffected in any way by the rotative movement of the member 5 about thepivot 6, because the joint 41 permits rotative movement of the upperportion of the member 40. p

In orderto permit inspections of the regulating mechanism disposedwithin the shell 18, I make the shell 18 of parts which are firmlysecured to each other, thus permitting the whole to ,be removed by theoperator. The upper platform 27, being supported by members 45 thatextend from the lower platform 12, supports the entire regulatingmechanism of the lamp which is attached to its lower side, as mentionedabove. This form of structure permits the shell 18 to be easilywithdrawn without necessitating iss the removal of any of the memberscomprising the regulating mechanism of the lamp.

In 'F ig. 2, I have shown an enlarged view of a portion of my arc lampstructure, the member 40 being shown in cross section. Leads 43, whichextend through the tubular member 42, are insulated from each other andthe lamp structure in any suitable manner. By being thus disposed in thetubular member 42, these leads are well protected.

l/Vhile I have herein described and illustrated, somewhat in detail, oneembodiment of my invention, it is not intended that my invention shallbe limited, in all its aspects, to this particular embodiment, as itwill be apparent to anyone skilled in the art that changes may be madein the form of my invention without departing from the spirit thereof.My invention is therefore to be understood as being limited only by thescope of the appended claims.

I claim as my invention:

1. The combination with a main support having a chamber in its upperend, and an annular member pivotally connected to the main support formovable engagement with the top surface thereof, of an arc lampmechanism supported on said annular mem ber, regulating coils disposedin said cham ber, and a member concentrically disposed in the pivotalconnection between said annular member and the main support and servingto transmit the movement occasioned by the regulating coils to said lampmecha- 1118111.

2. The combination with a main support, and an annular member pivotallyconnected thereto and adapted for rotative movement in a horizontalplane; of an arc lamp mech anism supported on said annular member, and ajointed member concentrically disposed in the pivotal connection betweensaid annular member and the main support for imparting movement to saidlamp mocha nism.

8. The combination with a main support and an annular member pivotallyconnected thereto and adapted for rotative movement in a horizontalplane, of an arc lamp supported on said annular member and comprisingregulating mechanism, an inner globe and a normally inclosing outerglobe, and a jointed member for imparting movement to the lampregulating mechanism and concentrically disposed in the pivotalconnection about which said annular member and are lamp are rotated whenaccess is desired to said inner globe.

I. In a post-type arc lamp, the combina tion with a pedestal having achamber in its upper end, of an annular member seated upon the topsurface of the pedestal and pivotally connected thereto for rotativemovement in a horizontal plane, a main platform supported by saidannular member, a "removable arc-inclosing globe attached to the lowerside of the main platform, an electrode-regulating mechanism supportedby said main platform, regulating coils disposed in the chamber in saidpedestal, and a member concentrically disposed in the pivotal connectionbetween said annular member and the pedestal for transmitting themovement occasioned by the regulating coils to said regulatingmechanism.

5. In a post-type are lamp, the combination with a pedestal having achamber in its upper end, of an annular member pivotally connectedthereto for rotative movement in a horizontal plane, an electroderegulating mechanism supported by said annular member, regulating coilsdisposed in the chamber in said pedestal, and a member concen' tricallydisposed in the pivotal connection between said annular member and thepedestal for transmitting the movement oceasioned by the regulatingcoils to said regulating mechanism.

(3. An arc lamp comprising a housing having one open end, a supportingbase member for said housing andnormally closing said end and meanspermitting said housing to be moved laterally with respect to said basemember to provide access to said housing.

7. An arc lamp comprising a housing having an opening and a supportingmember for said housing and normally closing said opening, said housingbeing eccentrically pivoted to said member in order that the housing maybe moved with respect to said member to provide access to said housingthrough said openin In testimony whereof, I have hereunto subscribed myname this 29th day of April, 1915.

CHRISTIAN AALBORG.

Copies of this patent may be obtained for five cents each, by addressingthe Commissioner of Patents, Washington, D. (1.

